public void StringInterning()
{
var s = new ReusableStream(100);
var strings = new[] { "cat", "deer", "snail", "dog", "frog", "human" };
const int max = 4;
const string exclude = "frog";
foreach (var str in strings)
{
s.WriteString(str, false);
}
s.ResetForReading();
// we're not interning yet - make sure new strings were returned
foreach (var str in strings)
{
var read = s.ReadString(false);
Assert.AreEqual(str, read);
Assert.AreNotSame(str, read);
}
s.ResetForReading();
var options = new StringSetOptions();
options.MaxEncodedSizeToLookupInSet = max;
Assert.Throws <InvalidOperationException>(() => s.SetDefaultStringSetOptions(options));
var set = new StringSet(10);
s.StringSet = set;
s.SetDefaultStringSetOptions(options);
s.StringSet = null;
// should throw because no StringSet has been provided
Assert.Throws <InvalidOperationException>(() => s.ReadString(false));
foreach (var str in strings)
{
if (str != exclude)
{
set.Add(str);
}
}
s.StringSet = set;
// read with interning (but no auto-interning)
foreach (var str in strings)
{
var read = s.ReadString(false);
Assert.AreEqual(str, read);
if (str.Length <= max && str != exclude)
{
Assert.AreSame(str, read);
}
else
{
Assert.AreNotSame(str, read);
}
}
// make sure the excluded string didn't get added to the set
Assert.AreEqual(null, set.GetExistingString(exclude.ToCharArray(), 0, exclude.Length));
s.ResetForReading();
options.PerformDangerousAutoAddToSet = true;
s.SetDefaultStringSetOptions(options);
// read with auto-interning
foreach (var str in strings)
{
var read = s.ReadString(false);
Assert.AreEqual(str, read);
if (str.Length <= max && str != exclude)
{
Assert.AreSame(str, read);
}
else
{
Assert.AreNotSame(str, read);
}
}
// make sure the excluded string got added to the set
Assert.AreEqual(exclude, set.GetExistingString(exclude.ToCharArray(), 0, exclude.Length));
}